I need urgently a zero voltage switch RS 305-800

For investigation purposes I need to find urgently this integrated circuit(#2): RS 305-800. I do not know who is the manufacturer of this zero voltage switch. The RS components said to me that this switch is discontinued now. I have an scientific project that is stoped now because this component is broken. Is it possible someone give me some help? Because it's urgent I accept a second hand component

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